CTICasesPulmonary Carcinoid Tumor (mimicking DIPNECH)
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Imaging findings
The lungs show a mosaic attenuation pattern, with small nodules clustered around small subsegmental vessels and bronchioles. A larger, 8-millimeter nodule is noted in the right middle lobe.
Key takeaways
Despite significant mosaic attenuation and air trapping, the patient was asymptomatic. The 8-millimeter nodule was biopsied due to a history of papillary thyroid cancer but turned out to be a typical carcinoid. While the imaging findings were highly suggestive of Diffuse Idiopathic Pulmonary Neuroendocrine Cell Hyperplasia (DIPNECH), there was insufficient tissue for a definitive pathological diagnosis of DIPNECH. This highlights that mosaic attenuation can be present without typical respiratory symptoms.
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